SBVR11 — inappropriate definitions of burinsss rule, rule statement

The restriction of the definition of “business rule” to include only those rules that “the semantic community can opt to change or discard” is inappropriate.
The SBVR definition of “rule statement” (“a guidance statement that expresses an operative business rule or a structural rule”) excludes those operative rules that are not business rules, for no obviously good reason.

The quoted phrase in the first sentence above is from the Note for 'business rule' rather than its Definition clause.
After discussion it was decided to improve the text of that Note to clarify the relationship between regulation/law ('external' to an organization) and the organization's own business rules:
• In the Note for the 'business rule' entry, add a reference to the Business Motivation Model [BMM], which has more to say about how regulations/laws relate to business rules and add clarifying examples and narrative.
The definition of rule statement needs no change since, by definition, there are no operative rules that are not business rules.